Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 226
on. This surface is divided by the circles C and D XX, § 170] SURFACES OF REVOLUTION 205 into two portions : the so-called outer portion, doubly convex,where a tangent plane contains but a single point of the sur-face, and an inner portion, concavo-convex, where a tangentplane at any point also… … Fig. 294. and B, which are parallels of the surface. Hence, if the sur-face is given as in Fig. 294, points assumed in the F-projectionmay represent, according to their position, one, two, three, orfour points lying in the surface. A point assumed in the H-projection, however, as in the ellipsoid,…
Geometry, Descriptive
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